use one of the "Linux" type settings and go for the default mem size etc etc.
Vmware will then install the guest OS directly from the DVD. BUT ---
Are you sure however that it's the actual OS and not just the Google Chrome Browser as I didn't think the OS was ready yet for PC's.
These people have had some sort of working version for a while - but I'm a bit suspicious of having to create an account first. Download Google Chrome OS for free - gdgt